Event Loop Visualizer

### Is this a unique feature?

- [X] I have checked "open" AND "closed" issues and this is not a duplicate

### Is your feature request related to a problem/unavailable functionality? Please describe.

I want to add a JavaScript event loop visualizer

### Proposed Solution

can I use typescript here??

### Screenshots


### Do you want to work on this issue?

Yes

### If "yes" to above, please explain how you would technically implement this (issue will not be assigned if this is skipped)

_No response_

The issue names no file, test, or entry point, so first inspect the repository structure and existing web tools before deciding where this belongs. Use the requested JavaScript event loop visualizer and the linked screenshot as the requirements; done means the visualizer is implemented and its behavior matches the agreed design.

Written by the indexing model from the issue text.